Table-Type Horizontal Boring Mills
Table-type horizontal boring mills are the most common configuration, featuring a worktable that moves longitudinally and transversely beneath a fixed spindle head. These machines handle medium to large workpieces and perform boring, milling, drilling, and tapping operations. The rotary table enables machining multiple faces in one setup, making them ideal for gearbox housings, pump bodies, and valve blocks.
Floor-Type and Planer-Type Boring Mills
Floor-type boring mills mount the workpiece directly on the shop floor or on fixture plates, while the spindle head travels on an elevated column rail. This design accommodates very large and heavy parts that cannot be placed on a conventional worktable. Planer-type boring mills combine a bridge structure with boring spindles for machining extremely large components such as machine tool bases and structural weldments.
Key Specifications to Consider
Spindle diameter determines boring bar rigidity and the maximum bore diameter the machine can produce. Common sizes range from eighty to one hundred sixty millimeters. Table load capacity, axis travel distances, and spindle speed range define the work envelope. Evaluate the machine positioning accuracy and repeatability specifications, as these directly impact the tolerances you can hold on finished parts.
Application Guidelines
Use rigid boring bars with minimal overhang to reduce deflection and chatter during internal machining. For heavy milling operations, engage multiple clamping points to secure the workpiece against cutting forces. When boring deep holes, use flood coolant directed at the cutting edge and retract periodically to clear chips. Plan setups to machine critical features first while the workpiece is most stable and rigid.
